Hi, I'm primarily a photographer and pretty lost in the retouching realm, but I'm working on learning. I don't have any sort of pen tablet to use while retouching, unfortunately. I do have a Nexus 7 though.

Using the Splashtop app, I can get fluid enough streaming that it makes an amazing 2nd display. I haven't messed around with trying to use it to replicate some of the functions of a pen tablet though. I do realize it isn't pressure sensitive.

Does anyone use an Android/iOS tablet along with a computer to help with retouching? I'd love to hear how, or if you think it's just overcomplicating things.

hey neighbor... it can be done... but I would seriously recommend getting at least a Wacom Bamboo tablet for around 100 at Best Buys. Pressure sensitive is the only true way to do editing... but yes you can do simple edits on the android

Yes...I must 2nd that! Get your hands on a Wacom Pen tablet. You will find that it offers a finer level of control and accuracy when making your edits. If you can trace in a coloring book, you can edit with a Pen Tablet! Having one completely changed my workflow.

An Android tablet is for general use and not specific to retouching. It lacks a lot of functions and editing freedom that a tablet can provide.
Try a starter's Wacom Bamboo, which is pretty cheap, with a 70$ pricetag. It's a decent size for retouches and does everything the larger tablets can do, with the added advantage its dimensions also make it great for travel